© 2010 Pearson Education, Inc. Clicker Questions for use with Classroom Response Systems Campbell Essential Biology, Fourth Edition – Simon, Reece, and Dickey Campbell Essential Biology with Physiology, Third Edition – Simon, Reece, and Dickey Questions prepared by Brad Williamson, updated by Mike Tveten Chapter 7 Photosynthesis: Using Light to Make Food

© 2010 Pearson Education, Inc. Concept Check produces products with higher stored energy (it is endergonic). releases energy (it is exergonic). has an equal amount of energy in the reactants and the products. is catabolic. The image on the right is the summary equation for the process of photosynthesis. This reaction

© 2010 Pearson Education, Inc. Concept Check Both cellular respiration and photosynthesis rely on electron transport chains embedded in membranes to produce ATP molecules. Which of the following correctly describes the difference between the two types of electron transport chains? a.In cellular respiration, the electron source is water and the final electron destination is oxygen. b.In cellular respiration, the electron source is energy- rich food and the final electron destination is oxygen. c.In photosynthesis, the electron source is water and the final electron destination is oxygen. d.Both b and c.

© 2010 Pearson Education, Inc. Concept Check When a photon of the correct energy is absorbed by a photosystem, an electron is energized and transferred to a primary electron acceptor. This creates an electron “hole.” How is the missing electron replaced? a.An electron removed from glucose replaces the missing electron. b.An electron from hydrogen made available by splitting water replaces the missing electron. c.The electron comes from ATP. d.The replacement electron comes from NADPH.

© 2010 Pearson Education, Inc. Concept Check Imagine that you have planted bean seedlings (C 3 ) and corn seedlings (C 4 ) in an artificial soil and sealed them in an aquarium. The aquarium has plenty of light, nutrients, and water but a given volume of air. Based on your knowledge of photorespiration, which of the following is most likely? a.Both kinds of plants should do equally well. b.As the plants photosynthesize, the carbon dioxide levels will fall, giving the C 3 plants the advantage. c.As the plants photosynthesize, the carbon dioxide levels will fall, giving the C 4 plants the advantage. d.The results are unpredictable.

© 2010 Pearson Education, Inc. Interpreting Data This graph shows the levels of CO 2 in the atmosphere measured at Hawaii’s Mauna Loa Observatory over the last 40+ years—the longest measurement of its kind. Take a close look at this graph. The next slides will have some questions for you to consider. Keeling, C.D. and T.P. Whorf Atmospheric CO 2 records from sites in the SIO air sampling network. In Trends: A Compendium of Data on Global Change. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tenn., U.S.A.

© 2010 Pearson Education, Inc. Interpreting Data Here’s a magnified view of five years of data on CO 2 levels. What do you think is the most likely cause for the cycles you see in this data? a.the differing amounts of CO 2 produced by plants during daylight and night hours b.volcanic emissions c.seasonal differences in CO 2 uptake by photosynthesizers

© 2010 Pearson Education, Inc. Interpreting Data Which of the following labeled points on the graph represent fall carbon dioxide levels in the Northern Hemisphere? a.A. b.B. c.C. d.D. A. B. C. D.

© 2010 Pearson Education, Inc. Interpreting Data The data indicate that carbon dioxide levels are rising. How much of an increase is indicated in the data over the last 40+ years? a.about a 60% increase b.about a 20% increase c.about a 10% increase d.about a 5% increase

© 2010 Pearson Education, Inc. Biology and Society This graph shows a correlation between global surface temperature and atmospheric carbon dioxide. The temperature and carbon dioxide increases are real—but direct correlation is difficult to prove. The United States has not signed the international Kyoto agreement that sets aggressive goals to reduce carbon dioxide emissions. Do you think we should have direct evidence before taking aggressive action? Strongly Agree Strongly Disagree A. E. C. B. D.

© 2010 Pearson Education, Inc. Biology and Society This graph shows a correlation between global surface temperature and atmospheric carbon dioxide. The temperature and carbon dioxide increases are real—but direct correlation is difficult to prove. The United States has not signed the international Kyoto agreement that sets aggressive goals to reduce carbon dioxide emissions. Do you think we had better start now to curb carbon dioxide emissions? Strongly Agree Strongly Disagree A. E. C. B. D.

© 2010 Pearson Education, Inc. Biology and Society This graph shows predicted carbon dioxide levels for three different global emission plans: A, no control; B, moderate control; and C, aggressive control. Do you think the United States should take the lead on curbing global carbon dioxide levels? Strongly Agree Strongly Disagree A. E. C. B. D.